Registration Examination for Dietitians (RD/RDN Exam) — Questions and Answers

Question 1: Caffeine improves exercise performance primarily through which mechanism?

Blocking adenosine receptors to reduce perception of fatigue (Correct answer)
Elevating body temperature to burn more fat
Directly increasing muscle fiber size
Increasing blood glucose by releasing stored glycogen

Correct answer: Blocking adenosine receptors to reduce perception of fatigue

Caffeine competitively blocks adenosine receptors in the brain, reducing the perception of effort and fatigue during exercise.

Question 2: Which electrolyte is most commonly lost and must be supplemented on a ketogenic diet?

Calcium
Iron
Zinc
Sodium (Correct answer)

Correct answer: Sodium

Sodium is rapidly lost through increased urination as insulin levels drop on a ketogenic diet, making supplementation essential.

Question 3: For a recreational exerciser doing 30–60 minutes of moderate activity, which pre-workout meal timing is most practical?

Consume protein only immediately before
Eat a large meal 15 minutes before
Exercise only in a 24-hour fast
Eat a balanced meal 1–3 hours before exercise (Correct answer)

Correct answer: Eat a balanced meal 1–3 hours before exercise

Eating a balanced meal 1–3 hours before moderate exercise allows digestion to proceed and provides readily available energy without GI discomfort.

Question 4: On the South Beach Diet, how is portion control typically handled?

Portions are determined by a daily point system
Precise calorie counting of every meal is required
Portions are controlled by focusing on hunger cues and approved food categories rather than strict calorie limits (Correct answer)
You can eat unlimited amounts of all approved foods

Correct answer: Portions are controlled by focusing on hunger cues and approved food categories rather than strict calorie limits

Rather than strict calorie counting, the South Beach Diet guides portion control through food quality choices and eating until satisfied — not stuffed.

Question 5: The Physicians Committee for Responsible Medicine (PCRM) recommends a plant-based diet for what primary health benefit?

Reducing the risk of heart disease, cancer, and type 2 diabetes (Correct answer)
Increased athletic performance only
Improving eyesight
Building maximum muscle mass

Correct answer: Reducing the risk of heart disease, cancer, and type 2 diabetes

PCRM advocates plant-based diets primarily for their well-documented ability to reduce risks of heart disease, certain cancers, and type 2 diabetes.

Question 6: Which type of carbohydrate is digested most slowly and helps regulate blood sugar?

Refined grains
Complex carbohydrates (Correct answer)
Simple sugars
High-fructose corn syrup

Correct answer: Complex carbohydrates

Complex carbohydrates contain long chains of glucose that digest slowly, providing sustained energy and stabilizing blood sugar.

Question 7: Which form of omega-3 fatty acid found primarily in fatty fish has the most direct anti-inflammatory benefit for exercising muscles?

EPA and DHA (Correct answer)
GLA (gamma-linolenic acid)
LA (linoleic acid)
ALA (alpha-linolenic acid)

Correct answer: EPA and DHA

EPA and DHA from marine sources are long-chain omega-3s that directly reduce exercise-induced inflammation and may support muscle protein synthesis.

Question 8: True or false: All meals with the claim "trans fat free" are beneficial for heart health

False (Correct answer)
True

Correct answer: False

A 'trans fat free' claim only indicates the absence of trans fats, which are harmful, but it doesn't guarantee overall heart health benefits. The meal could still be high in saturated fat, sodium, sugar, or total calories, all of which can negatively impact heart health. A holistic nutritional assessment is necessary.

Question 9: Which calcium-rich plant-based food is also fortified in many plant milks?

Broccoli and green peas
Almonds and almond milk
Soy milk and fortified plant milks (Correct answer)
Spinach only

Correct answer: Soy milk and fortified plant milks

Fortified soy milk and other plant milks are excellent calcium sources for plant-based eaters, often providing similar calcium levels to cow's milk.

Question 10: What happens when carbohydrate intake is severely restricted and the body shifts to fat as its primary fuel?

Gluconeogenesis
Ketosis (Correct answer)
Lipolysis
Glycolysis

Correct answer: Ketosis

Ketosis occurs when the liver produces ketone bodies from fat as an alternative fuel source when glucose is scarce.

Question 11: Which of the following is an example of a whole grain food?

Oatmeal (Correct answer)
White rice
Enriched white bread
Cornstarch

Correct answer: Oatmeal

Oatmeal is made from whole oats and retains the bran, germ, and endosperm, making it a true whole grain food.

Question 12: Which countries are considered the traditional origin of the Mediterranean diet?

Turkey and Egypt
Morocco and Tunisia
France and Germany
Greece, Italy, and Spain (Correct answer)

Correct answer: Greece, Italy, and Spain

The Mediterranean diet is rooted in the traditional eating patterns of Greece, Italy, and Spain, regions bordering the Mediterranean Sea.

Question 13: Which condition describes the triad of disordered eating, amenorrhea, and low bone density commonly seen in female athletes?

Anemia trifecta
Female Athlete Triad (Correct answer)
Overtraining syndrome
Metabolic syndrome

Correct answer: Female Athlete Triad

The Female Athlete Triad links low energy availability (often from disordered eating) to hormonal disruption causing loss of menstrual function and reduced bone density.

Question 14: Which of the following sweeteners is generally considered keto-friendly?

Honey
High-fructose corn syrup
Table sugar
Stevia (Correct answer)

Correct answer: Stevia

Stevia is a zero-calorie, zero-carb natural sweetener that does not raise blood sugar and is considered keto-friendly.

Question 15: Which statement about alcohol on the South Beach Diet is accurate?

Beer is the preferred alcoholic beverage on all phases
Alcohol has no impact on the diet's results
Moderate consumption of dry wine may be allowed starting in Phase 2 (Correct answer)
All alcohol is freely permitted in Phase 1

Correct answer: Moderate consumption of dry wine may be allowed starting in Phase 2

Alcohol is restricted in Phase 1, but moderate amounts of dry wine may be reintroduced in Phase 2 since it has a lower sugar content than most other alcoholic beverages.

Question 16: Which beverage is typically allowed during all phases of the South Beach Diet?

Fruit juice
Sweetened sports drinks
Regular soda
Water and unsweetened coffee or tea (Correct answer)

Correct answer: Water and unsweetened coffee or tea

Water and unsweetened beverages like coffee and tea are permitted throughout all phases, while sugary drinks are avoided.

Question 17: Which blood marker is often tested to confirm the body is in nutritional ketosis?

Hemoglobin A1c
LDL cholesterol
C-reactive protein
Beta-hydroxybutyrate (Correct answer)

Correct answer: Beta-hydroxybutyrate

Beta-hydroxybutyrate (BHB) is the primary ketone body in the blood and is measured to confirm nutritional ketosis, typically above 0.5 mmol/L.

Question 18: Intermittent fasting primarily influences weight loss through which main mechanism?

Increasing basal metabolic rate significantly
Reducing overall calorie intake by limiting eating windows (Correct answer)
Enhancing nutrient absorption
Blocking dietary fat absorption

Correct answer: Reducing overall calorie intake by limiting eating windows

Intermittent fasting mainly promotes weight loss by naturally reducing total calorie intake through a restricted eating window, not by metabolic magic.

Question 19: What is the recommended daily sodium intake limit for most Americans according to current dietary guidelines?

3,500 mg
2,300 mg (Correct answer)
1,000 mg
1,500 mg

Correct answer: 2,300 mg

The 2020-2025 Dietary Guidelines recommend limiting sodium to less than 2,300 mg per day for most adults.

Question 20: Which of the following is a high-fat, keto-friendly food?

Olive oil (Correct answer)
Brown rice
Sweet potato
Oatmeal

Correct answer: Olive oil

Olive oil is nearly 100% fat with zero carbohydrates, making it an ideal staple for a ketogenic diet.

Question 21: What is 'time-restricted eating' (TRE)?

Eating only before noon each day
Limiting portion sizes at each meal
Confining all daily food intake to a specific time window (Correct answer)
Restricting eating to low-calorie times of day

Correct answer: Confining all daily food intake to a specific time window

Time-restricted eating involves consuming all daily calories within a defined time window, typically 8–12 hours, aligned with the body's circadian rhythm.

Question 22: Which of the following best describes the Mediterranean diet's approach to sweets and desserts?

Artificial sweeteners replace all sugar
Unlimited consumption of sweets
Sweets are consumed rarely and are naturally sweetened (e.g., fruit) (Correct answer)
Sweets are completely banned

Correct answer: Sweets are consumed rarely and are naturally sweetened (e.g., fruit)

The Mediterranean diet limits sweets and desserts to occasional consumption, with fresh fruit often serving as the preferred sweet ending to a meal.

Question 23: Which of the following vegetables is best suited for a ketogenic diet?

Beets
Carrots
Corn
Spinach (Correct answer)

Correct answer: Spinach

Spinach is very low in net carbs and high in micronutrients, making it an excellent vegetable choice for ketogenic dieters.

Question 24: What is the primary benefit of eating a variety of colorful fruits and vegetables?

Wider range of phytonutrients and vitamins (Correct answer)
Higher caloric intake
More protein per serving
Reduced fiber intake

Correct answer: Wider range of phytonutrients and vitamins

Different colors in fruits and vegetables indicate different phytonutrients and vitamins, so variety ensures a broader spectrum of nutrients.

Question 25: What distinguishes a plant-based diet from a vegan diet?

There is no difference between them
Plant-based diets are medically supervised; vegan diets are not
Plant-based diets allow fish; vegan diets do not
Plant-based diets focus on whole plant foods and may include small amounts of animal products; veganism excludes all animal products (Correct answer)

Correct answer: Plant-based diets focus on whole plant foods and may include small amounts of animal products; veganism excludes all animal products

A plant-based diet prioritizes whole plant foods and may allow small amounts of animal products, while veganism is an ethical lifestyle that strictly excludes all animal products.

Question 26: What role does physical activity play in the Mediterranean diet lifestyle?

It is discouraged to preserve energy
It is unrelated to the diet
It is a core component alongside dietary habits (Correct answer)
It is recommended only for weight loss

Correct answer: It is a core component alongside dietary habits

Regular physical activity — including walking and outdoor activities — is a core component of the Mediterranean lifestyle, complementing dietary habits.

Question 27: The Mediterranean diet encourages shared meals and social eating because of what broader principle?

Group eating improves digestion
It was originally designed for communal kitchens
It reduces portion sizes
Food culture and lifestyle are part of overall health (Correct answer)

Correct answer: Food culture and lifestyle are part of overall health

The Mediterranean diet emphasizes that food culture, lifestyle, social connections, and physical activity are all integral components of overall health and wellbeing.

Question 28: How many grams of protein per kilogram of body weight is generally recommended for a sedentary adult?

2.2 g/kg
0.8 g/kg (Correct answer)
1.6 g/kg
0.4 g/kg

Correct answer: 0.8 g/kg

The RDA for protein is 0.8 grams per kilogram of body weight per day for sedentary adults.

Question 29: What percentage of total daily calories is generally recommended to come from protein for a healthy adult?

10–35% (Correct answer)
5–10%
45–65%
20–40%

Correct answer: 10–35%

The Acceptable Macronutrient Distribution Range (AMDR) for protein is 10–35% of total daily calories.

Question 30: Which macronutrient is most critical for preserving lean muscle mass during a calorie-deficit diet?

Protein (Correct answer)
Fat
Carbohydrates
Fiber

Correct answer: Protein

Adequate protein intake during caloric restriction provides amino acids that help spare muscle tissue from being broken down for energy.

Question 31: Does intermittent fasting significantly slow metabolism compared to continuous calorie restriction?

Yes, it slows metabolism more than regular dieting
Yes, by 20–30% within weeks
No, it doubles metabolic rate
No, it may preserve metabolic rate better than continuous restriction (Correct answer)

Correct answer: No, it may preserve metabolic rate better than continuous restriction

Research suggests intermittent fasting may preserve resting metabolic rate better than continuous calorie restriction, which can more aggressively reduce metabolism.

Question 32: What is the primary benefit of aligning eating windows with earlier times of day?

It allows for larger meals
It prevents nighttime hunger
It aligns with circadian rhythms for better metabolic health (Correct answer)
It increases protein absorption

Correct answer: It aligns with circadian rhythms for better metabolic health

Early time-restricted eating that aligns with daylight hours supports the body's circadian rhythm, improving insulin sensitivity and metabolic health.

Question 33: What is 'heme iron' vs 'non-heme iron' relevant to plant-based diets?

Heme iron causes anemia; non-heme iron does not
Both types are equally absorbed regardless of source
Non-heme iron is from plants and is less readily absorbed than heme iron from animals (Correct answer)
Heme iron is from plants and is better absorbed; non-heme iron is from animals

Correct answer: Non-heme iron is from plants and is less readily absorbed than heme iron from animals

Non-heme iron from plant foods is less bioavailable than heme iron from animal foods; pairing plant iron with vitamin C can significantly improve absorption.

Question 34: The MyPlate model recommends that grains make up what fraction of your plate?

One third
One half
Two thirds
One quarter (Correct answer)

Correct answer: One quarter

MyPlate recommends grains fill one quarter of the plate, with at least half of those being whole grains.

Question 35: What distinguishes the South Beach Diet from a traditional low-fat diet?

South Beach requires counting every gram of fat
South Beach only restricts fat from animal sources
South Beach eliminates all dietary fat
South Beach focuses on fat quality rather than fat quantity (Correct answer)

Correct answer: South Beach focuses on fat quality rather than fat quantity

Unlike traditional low-fat diets, the South Beach Diet emphasizes choosing healthy fats (unsaturated) over harmful ones rather than minimizing total fat intake.

Question 36: What is 'food logging' and how does research support its effectiveness for weight loss?

Tracking food intake in a journal or app, which research shows improves weight loss outcomes (Correct answer)
Recording meal timing without tracking calories
Logging meals to share with a dietitian monthly
Photographing meals for social media

Correct answer: Tracking food intake in a journal or app, which research shows improves weight loss outcomes

Research shows that consistent food logging (tracking what you eat via app or journal) significantly improves weight loss outcomes by creating awareness of calorie intake.

Question 37: What role do B vitamins play in exercise performance?

They primarily reduce inflammation post-exercise
They increase testosterone production
They directly build muscle tissue
They serve as coenzymes in energy metabolism, helping convert food into usable ATP (Correct answer)

Correct answer: They serve as coenzymes in energy metabolism, helping convert food into usable ATP

B vitamins such as B1, B2, B3, B6, and B12 are essential cofactors in metabolic pathways that produce ATP from carbohydrates, fats, and protein.

Question 38: What is the primary role of carbohydrates in a balanced diet?

Building muscle tissue
Forming hormones
Transporting fat-soluble vitamins
Providing energy (Correct answer)

Correct answer: Providing energy

Carbohydrates are the body's preferred and primary source of energy, particularly for the brain and muscles.

Question 39: True/False: Time constraints and a lack of enjoyment are often the biggest obstacles to exercising.

False
True (Correct answer)

Correct answer: True

Many individuals cite busy schedules and the perception of not having enough time as major barriers to regular exercise. Additionally, if exercise is not enjoyable, it becomes difficult to sustain, leading to a lack of motivation and adherence.

Question 40: Which type of fish is most strongly emphasized in the Mediterranean diet?

Tilapia
Shellfish only
Catfish
Fatty fish like salmon and sardines (Correct answer)

Correct answer: Fatty fish like salmon and sardines

Fatty fish rich in omega-3 fatty acids, such as salmon, sardines, and mackerel, are emphasized at least twice per week in the Mediterranean diet.

Question 41: Which hormone's sensitivity improves with intermittent fasting?

Insulin (Correct answer)
Testosterone
Cortisol
Thyroid hormone

Correct answer: Insulin

Intermittent fasting improves insulin sensitivity, helping the body manage blood sugar more effectively and reducing the risk of type 2 diabetes.

Question 42: Which nutrient timing strategy has been shown to support muscle protein synthesis throughout the day?

Consuming all daily protein in one large evening meal
Avoiding protein before noon
Eating protein only immediately pre-workout
Distributing 20–40 g of protein evenly across 3–5 meals throughout the day (Correct answer)

Correct answer: Distributing 20–40 g of protein evenly across 3–5 meals throughout the day

Distributing protein intake evenly across meals maximizes muscle protein synthesis signaling because each serving stimulates anabolic pathways that a single large dose cannot sustain all day.

Question 43: Sodium loss through sweat during prolonged exercise can lead to a condition called what?

Hypertension
Hypoglycemia
Hyponatremia (Correct answer)
Hypernatremia

Correct answer: Hyponatremia

Hyponatremia (low blood sodium) can result from heavy sweating combined with drinking large volumes of plain water without sodium replacement.

Question 44: What is the 'Warrior Diet' in the context of intermittent fasting?

Fasting 3 days per week with large meals on other days
High-protein eating every 2 hours
Eating raw foods only during a 4-hour window at night
Fasting all day and eating one large meal at night within a 4-hour window (Correct answer)

Correct answer: Fasting all day and eating one large meal at night within a 4-hour window

The Warrior Diet involves eating small amounts of raw fruits and vegetables during the day and consuming one large meal at night within a 4-hour eating window.

Question 45: Which macronutrient plays the most important role in hormone production?

Protein
Fiber
Carbohydrates
Dietary fat (Correct answer)

Correct answer: Dietary fat

Dietary fat is essential for the production of steroid hormones including estrogen, testosterone, and cortisol.

Question 46: Which macronutrient has the highest thermic effect of food (TEF)?

Carbohydrates
Fat
Protein (Correct answer)
Alcohol

Correct answer: Protein

Protein has the highest thermic effect, requiring 20–30% of its caloric value just for digestion and metabolism.

Question 47: What does DHA and EPA (long-chain omega-3s) conversion from plant-based ALA involve?

No conversion is possible in humans
Inefficient conversion; algae-based supplements are often recommended (Correct answer)
Direct conversion with 100% efficiency
Conversion only occurs with B12 supplementation

Correct answer: Inefficient conversion; algae-based supplements are often recommended

The body converts ALA to DHA and EPA very inefficiently; algae-based omega-3 supplements are often recommended for plant-based eaters as a direct source.

Question 48: What distinguishes 'good carbs' from 'bad carbs' according to the South Beach Diet framework?

Bad carbs are those that contain any fiber
Good carbs are digested slowly with minimal blood sugar impact; bad carbs spike glucose rapidly (Correct answer)
Good carbs come only from animal products
Good carbs have more calories; bad carbs have fewer

Correct answer: Good carbs are digested slowly with minimal blood sugar impact; bad carbs spike glucose rapidly

Good carbs (whole grains, vegetables, legumes) are digested slowly, providing steady energy, while bad carbs (refined sugars, white flour) cause rapid blood sugar spikes.

Question 49: What iodine concern exists for people following a strict plant-based diet?

Plants block iodine absorption completely
Iodine is irrelevant for plant-based dieters
Most plant foods are low in iodine unless iodized salt or sea vegetables are included (Correct answer)
Plants contain too much iodine, causing thyroid problems

Correct answer: Most plant foods are low in iodine unless iodized salt or sea vegetables are included

Most plant foods are naturally low in iodine, so plant-based eaters should use iodized salt, eat sea vegetables, or take an iodine supplement to meet needs.

Question 50: What does 'sustainable weight loss' typically involve according to health guidelines in the US?

Losing 1–2 pounds per week through moderate lifestyle changes (Correct answer)
Losing 5+ pounds per week through very low calorie diets
Rapid initial weight loss followed by maintenance
Losing as much weight as possible as fast as possible

Correct answer: Losing 1–2 pounds per week through moderate lifestyle changes

US health guidelines (CDC, NHLBI) recommend losing 1–2 pounds per week through moderate calorie reduction and increased physical activity as the safest, most sustainable approach.

Question 51: Which of the following best describes how intermittent fasting affects muscle mass?

It can preserve muscle mass if protein intake and resistance training are adequate (Correct answer)
It has no effect on muscle mass
It increases muscle mass in all users
It always causes significant muscle loss

Correct answer: It can preserve muscle mass if protein intake and resistance training are adequate

With adequate protein intake and resistance exercise, intermittent fasting can preserve and even support muscle mass while reducing body fat.

Question 52: A person on the South Beach Diet is dining at a restaurant. Which entrée choice best aligns with Phase 2 guidelines?

Fried shrimp with white rice
Pasta primavera with white pasta
Cheeseburger on a brioche bun
Grilled chicken over mixed greens with olive oil dressing and a side of brown rice (Correct answer)

Correct answer: Grilled chicken over mixed greens with olive oil dressing and a side of brown rice

Grilled chicken, mixed greens, olive oil dressing, and brown rice represent lean protein, healthy fats, non-starchy vegetables, and a low-glycemic whole grain — all Phase 2 compatible.

Question 53: What is the primary fuel source for the brain on a well-established ketogenic diet?

Glucose
Protein
Glycogen
Ketone bodies (Correct answer)

Correct answer: Ketone bodies

After adaptation, the brain can meet up to 70% of its energy needs from ketone bodies instead of glucose.

Question 54: What is 'Eat Stop Eat' as an intermittent fasting protocol?

Alternating between eating and fasting every other day
Fasting for 24 hours once or twice per week (Correct answer)
Fasting for 12 hours daily
Eating one meal per day

Correct answer: Fasting for 24 hours once or twice per week

Eat Stop Eat involves doing one or two 24-hour fasts per week, with normal eating on the non-fasting days.

Question 55: Exercising in a fasted state in the morning may increase reliance on which fuel source?

Muscle glycogen
Blood glucose
Dietary protein exclusively
Dietary fat and free fatty acids (Correct answer)

Correct answer: Dietary fat and free fatty acids

After an overnight fast, insulin is low and glycogen is reduced, shifting the body toward fat oxidation during morning exercise.

Question 56: What is the primary goal of Phase 3 of the South Beach Diet?

Begin a strict calorie-counting regimen
Eliminate all carbohydrates permanently
Maintain the healthy eating habits developed in Phases 1 and 2 as a lifelong lifestyle (Correct answer)
Return to eating high-glycemic foods freely

Correct answer: Maintain the healthy eating habits developed in Phases 1 and 2 as a lifelong lifestyle

Phase 3 is a maintenance phase designed to sustain the healthy eating patterns established earlier as a permanent lifestyle, not a temporary diet.

Question 57: Dairy consumption in the Mediterranean diet is mainly in what form?

Yogurt and cheese (Correct answer)
Ice cream and cream
Low-fat milk only
Whole milk and butter

Correct answer: Yogurt and cheese

Dairy in the Mediterranean diet is primarily consumed as yogurt (especially Greek yogurt) and cheese in moderate amounts.

Question 58: Nuts are allowed on the South Beach Diet primarily because they provide what benefit?

Large amounts of fiber with zero fat
Healthy unsaturated fats and protein that promote satiety (Correct answer)
High glycemic energy for workouts
High levels of simple carbohydrates for energy

Correct answer: Healthy unsaturated fats and protein that promote satiety

Nuts supply healthy unsaturated fats, protein, and fiber that help keep you full and support heart health on the South Beach Diet.

Question 59: True or false: You shouldn't eat fish more than once a month.

True
False (Correct answer)

Correct answer: False

Dietary guidelines from health organizations widely recommend eating fish, especially fatty fish rich in omega-3 fatty acids, at least two times per week for its heart-healthy benefits. Limiting fish consumption to once a month would mean missing out on these important nutritional advantages.

Question 60: How often does the Mediterranean diet recommend eating red meat?

Never
Several times per week
Rarely or a few times per month (Correct answer)
Daily

Correct answer: Rarely or a few times per month

The Mediterranean diet recommends limiting red meat to a few times per month, emphasizing fish, poultry, and plant proteins instead.

Question 61: How many calories does one gram of fat provide?

9 calories (Correct answer)
4 calories
7 calories
5 calories

Correct answer: 9 calories

Fat is the most calorie-dense macronutrient, providing 9 calories per gram.

Question 62: How does exercise-induced sweating affect dietary electrolyte needs?

It reduces the need for all electrolytes
It has no impact on electrolyte needs
It significantly increases needs for sodium, potassium, and magnesium (Correct answer)
It only increases the need for calcium

Correct answer: It significantly increases needs for sodium, potassium, and magnesium

Sweat contains electrolytes, particularly sodium, and prolonged exercise increases the need to replenish sodium, potassium, and magnesium to maintain fluid balance and muscle function.

Question 63: What is the most common intermittent fasting protocol?

5:2 method
Alternate day fasting
16:8 method (Correct answer)
24-hour fast

Correct answer: 16:8 method

The 16:8 method — fasting for 16 hours and eating within an 8-hour window — is the most popular and widely practiced intermittent fasting protocol.

Question 64: What does BMR (Basal Metabolic Rate) represent?

Maximum calorie intake for weight loss
Calories needed to maintain weight with a sedentary lifestyle
Calories burned during exercise
Calories the body burns at rest to maintain basic physiological functions (Correct answer)

Correct answer: Calories the body burns at rest to maintain basic physiological functions

BMR is the number of calories the body needs to sustain basic functions (breathing, circulation, cell repair) at complete rest.

Question 65: Which plant-based food is an excellent source of omega-3 fatty acids?

Flaxseeds (Correct answer)
White rice
White potatoes
Iceberg lettuce

Correct answer: Flaxseeds

Flaxseeds are rich in ALA (alpha-linolenic acid), an omega-3 fatty acid, and are one of the best plant-based sources of this essential fat.

Question 66: A diet rich in which type of fat is associated with raising HDL (good) cholesterol?

Hydrogenated fats
Saturated fats
Trans fats
Unsaturated fats (Correct answer)

Correct answer: Unsaturated fats

Unsaturated fats, especially polyunsaturated and monounsaturated fats, can raise HDL cholesterol and support cardiovascular health.

Question 67: How does intermittent fasting affect growth hormone (HGH) levels?

HGH decreases during fasting
HGH levels are unaffected by fasting
HGH increases significantly during fasting (Correct answer)
HGH is converted to insulin during fasting

Correct answer: HGH increases significantly during fasting

Fasting has been shown to significantly increase growth hormone levels, which supports fat burning and muscle preservation.

Question 68: For a person trying to lose weight, which statement about exercise and appetite is most supported by research?

Exercise always suppresses appetite, making weight loss easy
Exercise has zero effect on appetite hormones
Strength training always increases appetite more than cardio
High-intensity exercise may temporarily suppress appetite, but compensation eating often offsets calories burned (Correct answer)

Correct answer: High-intensity exercise may temporarily suppress appetite, but compensation eating often offsets calories burned

Research shows that many people unconsciously compensate for exercise calories through increased food intake or reduced non-exercise activity, blunting expected weight loss.

Question 69: What is the approximate caloric split (carbs/fat/protein) suggested by the USDA Dietary Guidelines for a balanced diet?

50/40/10
60/20/20
30/50/20
45–65% / 20–35% / 10–35% (Correct answer)

Correct answer: 45–65% / 20–35% / 10–35%

The USDA Dietary Guidelines align with AMDR ranges: 45–65% carbohydrates, 20–35% fat, and 10–35% protein.

Question 70: Which vitamin is uniquely found in animal foods and not naturally present in plant foods?

Folate
Vitamin B12 (Correct answer)
Vitamin K
Vitamin C

Correct answer: Vitamin B12

Vitamin B12 is naturally found only in animal-derived foods, making supplementation important for vegans.

Question 71: How many calories does one gram of carbohydrate provide?

4 calories (Correct answer)
9 calories
7 calories
2 calories

Correct answer: 4 calories

Carbohydrates provide 4 calories per gram, the same as protein.

Question 72: What is the concept of 'protein complementarity' in plant-based nutrition?

Avoiding plant proteins that compete with absorption
Eating protein supplements alongside plant foods
Eating complete proteins at every meal separately
Combining different plant proteins to ensure all essential amino acids are obtained (Correct answer)

Correct answer: Combining different plant proteins to ensure all essential amino acids are obtained

Protein complementarity involves combining plant protein sources (like rice and beans) to provide all essential amino acids, though this doesn't need to happen at every single meal.

Question 73: What macronutrient ratio is typical for a standard ketogenic diet?

60% fat, 20% protein, 20% carbs
50% fat, 30% protein, 20% carbs
70% fat, 25% protein, 5% carbs (Correct answer)
40% fat, 40% protein, 20% carbs

Correct answer: 70% fat, 25% protein, 5% carbs

A standard ketogenic diet typically consists of 70% fat, 25% protein, and only 5% carbohydrates to induce ketosis.

Question 74: The Mediterranean diet has been shown to reduce the risk of which condition?

Hypoglycemia
Hypothyroidism
Osteoporosis
Cardiovascular disease (Correct answer)

Correct answer: Cardiovascular disease

Numerous large studies, including the PREDIMED trial, have shown the Mediterranean diet significantly reduces the risk of cardiovascular disease.

Question 75: What is a key reason the South Beach Diet restricts high-glycemic foods?

They cause rapid blood sugar spikes followed by crashes and cravings (Correct answer)
They interfere with vitamin absorption
They increase fiber intake too quickly
They contain too much protein

Correct answer: They cause rapid blood sugar spikes followed by crashes and cravings

High-glycemic foods cause rapid blood sugar spikes and subsequent crashes, triggering hunger and cravings that derail weight loss.

Question 76: Which plant food is considered a complete protein (containing all essential amino acids)?

Rice
Quinoa (Correct answer)
Almonds
Lentils

Correct answer: Quinoa

Quinoa is a complete protein, meaning it contains all nine essential amino acids, making it an excellent plant-based protein source.

Question 77: Which nutrient found in plants inhibits iron and zinc absorption and must be considered in plant-based diets?

Phytates (phytic acid) (Correct answer)
Fiber
Carotenoids
Polyphenols

Correct answer: Phytates (phytic acid)

Phytates (phytic acid) in grains, legumes, and seeds bind to minerals like iron and zinc, reducing their absorption in the gut.

Question 78: What are essential amino acids?

Amino acids found only in plant foods
Amino acids the body can produce on its own
Amino acids used solely for energy production
Amino acids that must be obtained through diet (Correct answer)

Correct answer: Amino acids that must be obtained through diet

Essential amino acids cannot be synthesized by the body and must be consumed through food.

Question 79: An athlete training twice per day should prioritize which recovery nutrition strategy between sessions?

A full 3-hour fast to allow muscle repair
High-fiber vegetables only
High-fat meal to replenish energy
Carbohydrate-rich snack within 30 minutes (Correct answer)

Correct answer: Carbohydrate-rich snack within 30 minutes

Consuming carbohydrates within 30 minutes post-session rapidly restores glycogen, enabling adequate energy for the second training bout.

Question 80: Which macronutrient provides 9 calories per gram, the highest of all macronutrients?

Carbohydrates
Fat (Correct answer)
Protein
Fiber

Correct answer: Fat

Dietary fat provides 9 calories per gram, compared to 4 calories per gram for both carbohydrates and protein.

Question 81: Which of the following snacks best fits South Beach Diet Phase 1 guidelines?

Celery with almond butter (Correct answer)
A banana with honey
A handful of pretzels
Crackers and cheese spread

Correct answer: Celery with almond butter

Celery (non-starchy vegetable) with almond butter (healthy fats and protein) is ideal for Phase 1, avoiding refined carbs and sugar.

Question 82: Which vitamin requires fat to be properly absorbed in the body?

Vitamin B6
Vitamin D (Correct answer)
Vitamin B12
Vitamin C

Correct answer: Vitamin D

Vitamin D is fat-soluble and requires dietary fat for proper absorption in the digestive tract.

Question 83: What is 'food volume eating' as a weight loss strategy?

Consuming large portions of low-calorie-density foods to feel full (Correct answer)
Measuring food by volume instead of weight
Eating the same volume at every meal regardless of food type
Drinking large amounts of water before meals only

Correct answer: Consuming large portions of low-calorie-density foods to feel full

Volumetric or volume eating involves filling meals with high-volume, low-calorie foods (vegetables, broth, fruit) to achieve satiety without excess calories.

Question 84: Resistance training primarily increases resting metabolic rate by doing what?

Elevating cortisol levels chronically
Reducing appetite hormones
Building lean muscle mass that burns more calories at rest (Correct answer)
Increasing body temperature permanently

Correct answer: Building lean muscle mass that burns more calories at rest

Muscle tissue is metabolically active and burns more calories at rest than fat tissue, so increasing muscle mass raises the basal metabolic rate.

Question 85: Which of the following foods is highest in healthy unsaturated fats?

Butter
Avocado (Correct answer)
Whole milk
Coconut oil

Correct answer: Avocado

Avocado is rich in monounsaturated fats, which are associated with heart health and reduced inflammation.

Question 86: True/False: Adding physical activity to your regular routine is a surefire method to lower your risk of heart disease.

True (Correct answer)
False

Correct answer: True

Regular physical activity significantly strengthens the heart, improves blood circulation, lowers blood pressure and cholesterol levels, and helps maintain a healthy weight. These combined effects are well-documented to substantially reduce the risk of developing heart disease.

Question 87: Which food group provides the most complete source of all essential amino acids?

Legumes
Grains
Animal proteins (Correct answer)
Nuts

Correct answer: Animal proteins

Animal proteins such as meat, eggs, and dairy contain all essential amino acids in adequate proportions, making them complete proteins.

Question 88: What is glycogen?

The stored form of carbohydrates in the liver and muscles (Correct answer)
A type of dietary fat stored in adipose tissue
A protein used for immune function
A hormone that regulates fat metabolism

Correct answer: The stored form of carbohydrates in the liver and muscles

Glycogen is the stored form of glucose found primarily in the liver and skeletal muscle for quick energy release.

Question 89: Which beverage is consumed in moderation and considered part of the traditional Mediterranean diet?

Spirits
Soda
Beer
Red wine (Correct answer)

Correct answer: Red wine

Red wine is traditionally consumed in moderation (one glass per day for women, up to two for men) with meals as part of the Mediterranean lifestyle.

Question 90: What does research suggest about plant-based diets and the risk of type 2 diabetes?

Plant-based diets have no effect on diabetes risk
Only vegan diets (not plant-based) reduce diabetes risk
Plant-based diets increase type 2 diabetes risk
Plant-based diets are associated with significantly lower type 2 diabetes risk (Correct answer)

Correct answer: Plant-based diets are associated with significantly lower type 2 diabetes risk

Multiple large studies show that plant-based diets are associated with significantly lower risk of developing type 2 diabetes due to improved insulin sensitivity and weight management.

Question 91: What is the recommended daily fiber intake for adult women under 50 according to US dietary guidelines?

25 grams (Correct answer)
21 grams
15 grams
38 grams

Correct answer: 25 grams

The recommended daily fiber intake for adult women under 50 is 25 grams per day.

Question 92: After how many hours of fasting does the body typically begin significantly increasing fat oxidation?

30–36 hours
2–4 hours
8–12 hours (Correct answer)
20–24 hours

Correct answer: 8–12 hours

After approximately 8–12 hours of fasting, liver glycogen stores deplete and the body increasingly shifts to burning fat for energy.

Question 93: Why does the South Beach Diet allow legumes like lentils and chickpeas during Phase 1?

They have a low glycemic index and provide fiber and plant protein (Correct answer)
They contain no carbohydrates
They have a very high glycemic index
They are high in fat and low in carbs

Correct answer: They have a low glycemic index and provide fiber and plant protein

Legumes have a low glycemic index due to their high fiber and protein content, which slows glucose absorption and makes them Phase 1 compatible.

Question 94: Which type of fat is found in avocados and olive oil and is considered heart-healthy?

Partially hydrogenated fat
Trans fat
Monounsaturated fat (Correct answer)
Saturated fat

Correct answer: Monounsaturated fat

Monounsaturated fats, found in avocados and olive oil, support heart health by improving cholesterol levels.

Question 95: Legumes are an important protein source in the Mediterranean diet. Which of the following is a legume?

Lentils (Correct answer)
Feta cheese
Quinoa
Almonds

Correct answer: Lentils

Lentils are legumes and are a key plant-based protein and fiber source in the Mediterranean diet.

Question 96: What role does sleep play in weight loss and appetite regulation?

Sleep has no effect on hunger or weight
More sleep directly burns fat
Poor sleep increases ghrelin (hunger hormone) and decreases leptin (satiety hormone), promoting overeating (Correct answer)
Sleep only affects energy levels, not food choices

Correct answer: Poor sleep increases ghrelin (hunger hormone) and decreases leptin (satiety hormone), promoting overeating

Insufficient sleep disrupts hunger hormones by raising ghrelin and lowering leptin, leading to increased appetite and cravings, especially for high-calorie foods.

Question 97: What does the term 'energy availability' mean in sports nutrition?

The total calories consumed in a day
Calorie surplus needed for weight gain
Dietary energy remaining after subtracting exercise energy expenditure, relative to lean body mass (Correct answer)
The glycogen stored in muscles before exercise

Correct answer: Dietary energy remaining after subtracting exercise energy expenditure, relative to lean body mass

Energy availability = (dietary intake − exercise energy cost) ÷ fat-free mass; low energy availability can impair hormonal and metabolic function.

Question 98: A person consuming 2,000 calories daily should aim for how many calories from added sugars according to the 2020-2025 Dietary Guidelines?

Less than 300 calories
Less than 200 calories (Correct answer)
Less than 100 calories
Less than 50 calories

Correct answer: Less than 200 calories

The 2020-2025 Dietary Guidelines recommend limiting added sugars to less than 10% of total daily calories, which equals less than 200 calories on a 2,000-calorie diet.

Question 99: What is the typical daily carbohydrate limit to maintain ketosis?

100–150 grams
20–50 grams (Correct answer)
50–75 grams
75–100 grams

Correct answer: 20–50 grams

Most ketogenic protocols restrict net carbohydrates to 20–50 grams per day to keep the body in ketosis.

Question 100: Which dietary approach is most appropriate for an athlete needing to lose body fat while maintaining training performance?

Alternating between binging and severe restriction weekly
A modest 300–500 kcal/day deficit with high protein and periodized carbohydrates (Correct answer)
Complete elimination of carbohydrates
A 1,000 kcal/day deficit regardless of training load

Correct answer: A modest 300–500 kcal/day deficit with high protein and periodized carbohydrates

A modest deficit paired with high protein and adjusted carbohydrate intake allows gradual fat loss while preserving muscle mass and supporting training quality.

Question 101: Which of the following beverages adds significant empty calories and can hinder weight loss?

Unsweetened green tea
Plain sparkling water
Sugar-sweetened beverages (sodas, juices) (Correct answer)
Black coffee

Correct answer: Sugar-sweetened beverages (sodas, juices)

Sugar-sweetened beverages add substantial calories without promoting satiety, making them a leading contributor to excess calorie intake and weight gain.

Question 102: Which mineral is essential for building strong bones and teeth and is found abundantly in dairy products?

Zinc
Magnesium
Iron
Calcium (Correct answer)

Correct answer: Calcium

Calcium is the primary mineral in bones and teeth, and dairy products like milk and yogurt are among the richest sources.

Question 103: A well-planned plant-based diet can be nutritionally complete for which life stages?

Adults and elderly only
Adults only
All life stages including infancy, childhood, pregnancy, and older adulthood (Correct answer)
Only for people under 50 without health conditions

Correct answer: All life stages including infancy, childhood, pregnancy, and older adulthood

Major dietetic associations, including the Academy of Nutrition and Dietetics, state that well-planned plant-based diets are nutritionally adequate for all stages of life.

Question 104: Which fat type is considered the most harmful to cardiovascular health and is largely artificial?

Trans fat (Correct answer)
Omega-3 fatty acid
Monounsaturated fat
Polyunsaturated fat

Correct answer: Trans fat

Trans fats, especially industrial partially hydrogenated oils, raise LDL cholesterol and lower HDL, significantly increasing heart disease risk.

Question 105: Which vitamin is particularly important to supplement on a plant-based diet due to limited sun exposure and lack of dietary sources?

Vitamin C
Vitamin D (Correct answer)
Vitamin A
Vitamin E

Correct answer: Vitamin D

Vitamin D is limited in plant foods and many people, especially those indoors, are deficient; supplementation or fortified foods are important on a plant-based diet.

Question 106: Which food group forms the base of the Mediterranean diet pyramid?

Whole grains, legumes, and plant foods (Correct answer)
Fruits and vegetables
Meat
Dairy

Correct answer: Whole grains, legumes, and plant foods

The base of the Mediterranean diet pyramid consists of whole grains, legumes, fruits, vegetables, nuts, and seeds eaten at every meal.

Question 107: Saturated fats are generally found in greatest quantities in which type of food?

Salmon
Fatty beef (Correct answer)
Olive oil
Almonds

Correct answer: Fatty beef

Fatty beef is high in saturated fat, which is predominantly found in animal products, particularly red meat and full-fat dairy.

Question 108: Which grain product is a staple of the Mediterranean diet?

White rice
Instant oatmeal
Refined pasta only
Whole grain bread and pasta (Correct answer)

Correct answer: Whole grain bread and pasta

Whole grain breads, pastas, and other minimally processed grains are staples of the Mediterranean diet, providing fiber and sustained energy.

Question 109: Which eating pattern is associated with reducing the risk of chronic diseases such as heart disease and type 2 diabetes?

High-protein, zero-carb diet
Carnivore diet
Mediterranean diet (Correct answer)
High-sugar, low-fat diet

Correct answer: Mediterranean diet

The Mediterranean diet, rich in vegetables, fruits, whole grains, legumes, and healthy fats, is strongly linked to reduced risk of chronic disease.

Question 110: Which protein source would be most consistent with South Beach Diet Phase 1 guidelines?

Pepperoni pizza
Breaded fish sticks
Grilled salmon (Correct answer)
Fried chicken with breading

Correct answer: Grilled salmon

Grilled salmon provides lean protein and heart-healthy omega-3 fatty acids without the refined carbs found in breaded or fried options.

Question 111: Which cooking technique helps reduce phytates in legumes and improve mineral absorption?

Frying at high heat
Freezing
Microwaving
Soaking and sprouting (Correct answer)

Correct answer: Soaking and sprouting

Soaking, sprouting, and fermenting legumes and grains reduces their phytate content, improving the bioavailability of minerals like iron and zinc.

Question 112: What are ketone bodies primarily produced from on a ketogenic diet?

Fatty acids (Correct answer)
Amino acids
Protein
Glucose

Correct answer: Fatty acids

Ketone bodies are produced in the liver primarily from fatty acids when carbohydrate intake is very low.

Question 113: Which vitamin is essential for calcium absorption, which supports bone health during weight-bearing exercise?

Vitamin C
Vitamin A
Vitamin K
Vitamin D (Correct answer)

Correct answer: Vitamin D

Vitamin D regulates calcium absorption in the gut, making it critical for maintaining bone density in athletes and active individuals.

Question 114: True or false: When more people join a healthy lifestyle plan, weight loss becomes more difficult.

True
False (Correct answer)

Correct answer: False

Joining a healthy lifestyle plan with more people often provides a supportive community, increased motivation, and shared accountability, which can make weight loss easier and more sustainable. Social support is a recognized factor in successful health behavior change.

Question 115: What is the primary advantage of chocolate milk as a post-workout recovery beverage?

It contains caffeine to boost the next workout
It provides an ideal 3:1 or 4:1 carbohydrate-to-protein ratio for glycogen replenishment and muscle repair (Correct answer)
It is the lowest sugar option available
It is calorie-free

Correct answer: It provides an ideal 3:1 or 4:1 carbohydrate-to-protein ratio for glycogen replenishment and muscle repair

Chocolate milk naturally provides carbohydrates and protein in a ratio shown to support glycogen resynthesis and muscle protein synthesis after exercise.

Question 116: Which of the following foods is NOT typically allowed on a ketogenic diet?

Avocado
Cheese
White bread (Correct answer)
Bacon

Correct answer: White bread

White bread is high in carbohydrates and is not allowed on a ketogenic diet, which restricts carbs to about 20–50g per day.

Question 117: Which type of exercise is most effective for improving insulin sensitivity?

Stretching and yoga only
High-intensity sprinting only
Combined aerobic and resistance training (Correct answer)
Low-intensity walking under 15 minutes

Correct answer: Combined aerobic and resistance training

A combination of aerobic and resistance exercise produces the greatest improvements in insulin sensitivity by targeting multiple glucose-uptake pathways.

Question 118: Which type of fat is emphasized as 'good' and encouraged on the South Beach Diet?

Trans fat from processed foods
Hydrogenated vegetable shortening
Unsaturated fat from olive oil and nuts (Correct answer)
Saturated fat from red meat

Correct answer: Unsaturated fat from olive oil and nuts

The South Beach Diet encourages unsaturated fats from sources like olive oil, avocado, and nuts while limiting saturated and trans fats.

Question 119: A vegetarian who eats dairy and eggs but no meat is classified as which type?

Pescatarian
Lacto-ovo vegetarian (Correct answer)
Flexitarian
Vegan

Correct answer: Lacto-ovo vegetarian

A lacto-ovo vegetarian avoids meat and fish but includes dairy products (lacto) and eggs (ovo) in their diet.

Question 120: How long should someone adhere to Phase One of the South Beach Diet?

Three Weeks
One Week
Two Weeks (Correct answer)
Four Weeks

Correct answer: Two Weeks

Phase One of the South Beach Diet is the most restrictive phase, designed to eliminate cravings and jumpstart weight loss. It typically lasts for two weeks, after which individuals transition to Phase Two.

Question 121: What macronutrient should NOT be eliminated for sustainable weight loss according to most nutrition guidelines?

Protein
No macronutrient should be eliminated (Correct answer)
Fat
Carbohydrates

Correct answer: No macronutrient should be eliminated

Most nutrition guidelines recommend reducing but not eliminating any macronutrient for sustainable weight loss, as balance supports long-term adherence and health.

Question 122: What stage of the South Beach Diet results in the greatest weight loss?

Phase Two
Phase Three
Phase One (Correct answer)
Phase Four

Correct answer: Phase One

Phase One of the South Beach Diet is designed to be the most restrictive, eliminating most carbohydrates and sugars to rapidly reduce cravings and initiate significant weight loss. This initial phase typically yields the quickest and most substantial weight reduction.

Question 123: What is the recommended carbohydrate intake per hour for endurance events lasting more than 2.5 hours?

60–90 g/hr (Correct answer)
30–60 g/hr
100–120 g/hr
10–20 g/hr

Correct answer: 60–90 g/hr

Research supports 60–90 g of carbohydrates per hour (using multiple transportable carbs) for events exceeding 2.5 hours to sustain performance.

Question 124: What is the primary fuel source for moderate-intensity aerobic exercise lasting longer than 20 minutes?

Alcohol
Protein
Carbohydrates
Fat (Correct answer)

Correct answer: Fat

After the first 20 minutes of moderate aerobic exercise, fat becomes the dominant fuel source as glycogen stores deplete.

Question 125: Which dietary strategy is most associated with reducing delayed onset muscle soreness (DOMS)?

High sugar intake immediately post-workout
Consuming only carbohydrates after training
Restricting all food for 4 hours post-exercise
Adequate protein and anti-inflammatory foods like tart cherry juice (Correct answer)

Correct answer: Adequate protein and anti-inflammatory foods like tart cherry juice

Protein supports muscle repair and anti-inflammatory compounds in foods like tart cherry juice have been shown in studies to reduce DOMS severity.

Registration Examination for Dietitians (RD/RDN Exam)

The CDR Registration Examination for Dietitians assesses entry-level competency in nutrition care, dietetics principles, food and nutrition science, and management of food systems to credential Registered Dietitian Nutritionists.

125

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180 min

Time Limit

70%

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